S14/S15 Differences

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I have been doing some reading and am trying to come up with a list of overall differences between the S14 and the S15 (apart from the obvious looks). There are some threads on this forum regarding the topic, but very few hit the nail on the head.

I'd like to know the differences, not only between the two SR20 engines, but LSD's, cams, injector sizes, transmission (5 speed vs 6 speed - is the 5 speed box really stronger), fuel pump, etc. Basically, mechanically, what are the major differences. The Wiki - Nissan Silvia website says:

"Japan saw a new version of the Silvia (S15) in 1999, now boasting 250 hp (184 kW) from its SR20DET engine, thanks to a ball-bearing turbocharger upgrade, as well as improved engine management."

As far as i know, the S14 was fitted with the larger T28, where has this additional power come from.

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